US20040057095A1 - Radiation image read-out apparatus and stimulating light cut filter - Google Patents
Radiation image read-out apparatus and stimulating light cut filter Download PDFInfo
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- US20040057095A1 US20040057095A1 US10/669,017 US66901703A US2004057095A1 US 20040057095 A1 US20040057095 A1 US 20040057095A1 US 66901703 A US66901703 A US 66901703A US 2004057095 A1 US2004057095 A1 US 2004057095A1
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- stimulating light
- stimulated emission
- cut filter
- radiation image
- light cut
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
- H04N1/0306—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array using a plurality of optical elements arrayed in the main scan direction, e.g. an array of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
- H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
- H04N1/0315—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors using photodetectors and illumination means mounted on separate supports or substrates or mounted in different planes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
- H04N2201/02493—Additional optical elements not otherwise provided for, e.g. filters, polarising plates, masks or apertures
Definitions
- This invention relates to a radiation image read-out apparatus and a stimulating light cut filter for the radiation image read-out apparatus, and more particularly to a radiation image read-out apparatus in which stimulated emission emitted from a radiation image convertor panel upon exposure to stimulating light is detected and to a stimulating light cut filter which transmits the stimulated emission but cuts the stimulating light.
- phosphor When certain kinds of phosphor are exposed to radiation such as X-rays, they store a part of energy of the radiation. Then when the phosphor which has been exposed to the radiation is exposed to stimulating light such as visible light, light is emitted from the phosphor in proportion to the stored energy of the radiation.
- a phosphor exhibiting such properties is generally referred to as “a stimulable phosphor”.
- the light emitted from the stimulable phosphor upon stimulation thereof will be referred to as “stimulated emission”.
- a radiation image recording and reproducing system comprising a radiation image recording apparatus and a radiation image read-out apparatus, as a CR (computed radiography) in which a layer of the stimulable phosphor is exposed to a radiation passing through an object such as a human body to have a radiation image of the object stored on the stimulable phosphor sheet as a latent image, stimulating light such as a laser beam is projected onto the stimulable phosphor sheet, and the stimulated emission emitted from the stimulable phosphor sheet is photoelectrically detected, thereby obtaining an image signal (a radiation image signal) representing a radiation image of the object.
- a radiation image convertor panel comprising a stimulable phosphor layer formed on a substrate as a recording medium employed in the radiation image recording and reproducing system.
- the radiation image read-out apparatus there has been known an apparatus comprising a detecting means which detects stimulated emission emitted from a radiation image convertor panel upon exposure to a line-like stimulating light beam extending in a main scanning direction and a stimulating light cut filter which is disposed between the radiation image convertor panel and the detecting means.
- the stimulating light cut filter is formed of, for instance, colored glass and transmits the stimulated emission but cuts the stimulating light. See, for instance, U.S. Pat. Nos. 6,479,835, 6,495,850, 6,501,088, 6,504,169, 6,512,240 and 6,528,812.
- the resolution can be increased by increasing the numerical aperture (NA) of the imaging optical system by bringing the detecting means nearer to the radiation image convertor panel.
- the detecting means can be brought nearer to the radiation image convertor panel by making thinner the stimulating light cut filter.
- the primary object of the present invention is to provide a stimulating light cut filter which can be thinner for given stimulating light cutting performance.
- Another object of the present invention is to provide a radiation image read-out apparatus employing such a stimulating light cut filter.
- a stimulating light cut filter which is disposed between a radiation image convertor panel, which emits stimulated emission upon exposure to stimulating light beam, and a detecting means, which detects the stimulated emission emitted from the radiation image convertor panel, to transmit the stimulated emission and cut the stimulating light and comprises
- a reflecting layer which reflects the stimulating light.
- a stimulating light cut filter which is disposed between a radiation image convertor panel, which emits stimulated emission upon exposure to stimulating light beam, and a detecting means, which detects the stimulated emission emitted from the radiation image convertor panel, to transmit the stimulated emission and cut the stimulating light and comprises
- At least one reflecting layer which reflects the stimulating light At least one reflecting layer which reflects the stimulating light.
- the “plurality of optical elements” may be bonded together by way of the reflecting layer.
- At least one reflecting layer be disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%.
- the transmissivity between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less.
- a radiation image read-out apparatus which is provided with a detecting means detecting stimulated emission emitted from a radiation image convertor panel upon exposure to a line-like stimulating light beam, and reads out a radiation image recorded on the radiation image convertor panel through an imaging optical system, wherein a stimulating light cut filter comprises an optical element which absorbs the stimulating light and a reflecting layer which reflects the stimulating light is disposed between the radiation image convertor panel and the detecting means to transmit the stimulated emission and cut the stimulating light.
- a radiation image read-out apparatus which is provided with a detecting means detecting stimulated emission emitted from a radiation image convertor panel upon exposure to a line-like stimulating light beam and reads out a radiation image recorded on the radiation image convertor panel through an imaging optical system, wherein a stimulating light cut filter comprising a plurality of optical elements which absorb the stimulating light and at least one reflecting layer which reflects the stimulating light is disposed between the radiation image convertor panel and the detecting means to transmit the stimulated emission and cut the stimulating light.
- the “plurality of optical elements” of the stimulating light cut filter may be bonded together by way of the reflecting layer.
- the reflecting layer of the stimulating light cut filter be disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less.
- the stimulating light cut filter in accordance with the first aspect of the present invention the stimulating light is cut by a combination of the optical element and the reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin.
- the stimulating light cut filter of the first aspect of the present invention can be used in an apparatus where the space between the radiation image convertor panel and the detecting means is small.
- the stimulating light cut filter in accordance with the second aspect of the present invention the stimulating light is cut by a combination of a plurality of optical elements and at least one reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin.
- the stimulating light cut filter of the second aspect of the present invention can be used in an apparatus where the space between the radiation image convertor panel and the detecting means is small.
- the stimulating light cut filter can be further smaller in thickness.
- the reflecting layer is disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter, reflection of the stimulating light at the face of the optical element upon which the stimulated emission impinges first can be reduced, whereby reentrance of the reflected stimulating light into the radiation image convertor panel can be suppressed.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%
- the thickness of the stimulating light cut filter can be surely reduced.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less, the thickness of the stimulating light cut filter can be further surely reduced.
- the stimulating light is cut by a combination of the optical element and the reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin.
- the imaging optical system can be brought nearer to the radiation image convertor panel and can have an increased numerical aperture (NA), whereby the stimulated emission can be imaged at a high resolution and the radiation image read out from the radiation image convertor panel can be high in quality.
- NA numerical aperture
- the stimulating light is cut by a combination of a plurality of optical elements and at least one reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin.
- the imaging optical system can be brought nearer to the radiation image convertor panel and can have an increased numerical aperture (NA), whereby the stimulated emission can be imaged at a high resolution and the radiation image read out from the radiation image convertor panel can be high in quality.
- NA numerical aperture
- the stimulating light cut filter can be further smaller in thickness.
- the reflecting layer is disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter, reflection of the stimulating light at the face of the optical element upon which the stimulated emission impinges first can be reduced, whereby reentrance of the reflected stimulating light into the radiation image convertor panel can be suppressed.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%
- the thickness of the stimulating light cut filter can be surely reduced.
- the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less, the thickness of the stimulating light cut filter can be further surely reduced.
- the stimulating light cut filter is formed by a combination of the optical element which absorbs the stimulating light and the reflecting layer which reflects the stimulating light, the thickness of the stimulating light cut filter can be greatly reduced. The reason for this will be described with reference to FIG. 6, hereinbelow.
- a stimulating light cut filter 50 is formed by a first optical element 51 absorbing the stimulating light, a stimulating light transmitting layer 52 formed on the stimulating light inlet side of the first optical element 51 , a first reflecting layer 53 formed on the stimulating light outlet side of the first optical element 51 to reflect the stimulating light, a second optical element 54 bonded to the stimulating light outlet side of the first optical element 51 by way of the first reflecting layer 53 and a second reflecting layer 55 formed on the stimulating light outlet side of the second optical element 54 .
- the transmissivity to the stimulating light of the first and second optical elements 51 and 54 is D
- the transmissivity to the stimulating light of the first and second reflecting layers 53 and 55 is T
- the transmissivity of the stimulating light transmitting layer 52 to the stimulating light is 1 (100%)
- the stimulating light enters the stimulating light cut filter 50 from the side of the stimulating light transmitting layer 52 .
- Intensity of the stimulating light impinging upon the stimulating light transmitting layer 52 is represented by Lin and the intensity of the stimulating light radiated from the second reflecting layer 55 is represented by Lout.
- transmissivity T 0.01 (transmissivity T is 1%)
- the transmissivity of the stimulating light cut filter is lower than 0.01%.
- transmissivity T 0.01 (transmissivity T is 1%)
- the transmissivity of the stimulating light cut filter is 0.5025% and the stimulating light cutting performance of the stimulating light cut filter is poorer.
- FIG. 1 is a perspective view briefly showing a radiation image read-out apparatus in accordance with an embodiment of the present invention
- FIG. 2 is an enlarged side view showing the stimulating beam projecting system and the line sensor employed in the radiation image read-out apparatus shown in FIG. 1,
- FIGS. 3A to 3 C are side views showing different stimulating light cut filters
- FIG. 4 is a perspective view for illustrating a radiation image read-out apparatus in accordance with another embodiment of the present invention.
- FIG. 5 is an enlarged side view showing the stimulating beam projecting system and the line sensor employed in the radiation image read-out apparatus shown in FIG. 4, and
- FIG. 6 is side view for illustrating the principle of the present invention.
- a radiation image read-out apparatus 100 in accordance with an embodiment of the present invention comprises a stimulating light beam projecting system 20 which projects onto a radiation image convertor panel 10 a line-like stimulating light beam Le extending in a main scanning direction X (the direction of arrow X in FIGS. 1 and 2), a light receiving system 30 which detects stimulated emission emitted from the radiation image convertor panel 10 upon exposure to the stimulating light beam Le, and a conveyor means (not shown) which conveys the light receiving system 30 relatively to the radiation image convertor panel 10 in a sub-scanning direction Y (the direction of arrow Y in FIGS. 1 and 2) intersecting the main scanning direction X.
- the stimulating light projecting system 20 comprises a broad area laser 21 which emits a stimulating light beam, a condenser optical system 22 which includes, for instance, a toric lens and converges a line-like stimulating light beam in a line-like area extending in the main scanning direction X on the radiation image convertor panel 10 by way of a reflecting mirror 23 , and projects a line-like stimulating light beam Le onto the surface of the radiation image convertor panel 10 .
- the stimulating light for instance, light of a wavelength in the range of 500 nm to 900 nm is employed.
- a semiconductor laser in 600 nm band is employed as the broad area laser 21 .
- the light receiving system 30 is provided with an imaging lens system 31 , a line sensor (detecting means) 32 formed by a number of CCDs arranged in the main scanning direction X, and a stimulating light cut filter 40 .
- the imaging lens system 31 comprises a number of lenses arranged in the main scanning direction X and forms an erected image of the line-like area of the radiation image convertor panel 10 exposed to the stimulating light beam Le on the line sensor 32 at unit magnification.
- the stimulating light cut filter 40 is inserted between the imaging lens system 31 and the line sensor 32 and transmits the stimulated emission but cuts the stimulating light.
- the stimulating light cut filter 40 comprises a colored glass plate, an optical element absorbing the stimulating light, and reflecting film (a reflecting layer) which is formed on the surface of the colored glass plate and reflects the stimulating light.
- the stimulating light cut filter 40 comprises a plurality of colored glass plates, optical elements absorbing the stimulating light, and reflecting film (a reflecting layer) which is formed on the surface of at least one of the colored glass plated and reflects the stimulating light.
- the stimulating light projecting system 20 and the light receiving system 30 are integrated with each other and are simultaneously conveyed in the sub-scanning direction by said conveyor means.
- a stimulating light beam Le emitted from stimulating light projecting system 20 is converged in a line-like area F extending in the main scanning direction X on the radiation image convertor panel 10 .
- the stimulated emission emitted from the line-like area F of the radiation image convertor panel 10 upon exposure to the stimulating light beam Le is imaged on the line sensor 32 through the imaging lens system 31 and the stimulating light cut filter 40 and is photoelectrically converted to be output as electric image signal components.
- the stimulating light projecting system 20 and the light receiving system 30 are simultaneously conveyed by said conveyor means in the sub-scanning direction Y, whereby a radiation image recorded on the radiation image convertor panel 10 is read out.
- a stimulating light cut filter 40 A in accordance with a first embodiment of the present invention comprises a colored glass plate 41 A, a stimulating light transmitting film 42 A, which transmits the stimulating light by about 100%, formed on the stimulating light inlet side of the colored glass plate 41 A and a stimulating light reflecting film 43 A formed on the stimulating light outlet side of the colored glass plate 41 A.
- the stimulating light transmissivity of the stimulating light reflecting film 43 A formed on the stimulating light outlet side of the colored glass plate 41 A is 1 ⁇ 10 ⁇ 2
- the stimulating light transmissivity of the stimulating light cut filter 40 A can be 1 ⁇ 10 ⁇ 10 , when the colored glass plate 41 A is 8 mm in thickness t1 and 1 ⁇ 10 ⁇ 8 in stimulating light transmissivity.
- the overall thickness of the stimulating light cut filter can be reduced by 20% (from 10 mm to 8 mm) for a given stimulating light cutting performance (1 ⁇ 10 ⁇ 10 ) as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter.
- a stimulating light cut filter 40 B in accordance with a second embodiment of the present invention comprises a first colored glass plate 41 B, a stimulating light transmitting film 42 B, which transmits the stimulating light by about 100%, formed on the stimulating light inlet side of the first colored glass plate 41 B, a first stimulating light reflecting film 43 B formed on the stimulating light outlet side of the first colored glass plate 41 B, a second colored glass plate 44 B bonded on the stimulating light outlet side of the first colored glass plate 41 B by way of the first stimulating light reflecting film 43 B, and a second stimulating light reflecting film 45 B formed on the stimulating light outlet side of the second colored glass plate 44 B.
- the stimulating light transmissivity of the stimulating light cut filter 40 B can be 1 ⁇ 10 ⁇ 10 , when the colored glass plates 41 B and 44 B are 6 mm in total thickness t2 and 1 ⁇ 10 ⁇ 6 in total stimulating light transmissivity.
- the overall thickness of the stimulating light cut filter can be reduced by 40% (from 10 mm to 6 mm) for a given stimulating light cutting performance (1 ⁇ 10 ⁇ 10 ) as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter.
- a stimulating light cut filter 40 C in accordance with a third embodiment of the present invention comprises a first colored glass plate 41 C, a stimulating light transmitting film 42 C, which transmits the stimulating light by about 100%, formed on the stimulating light inlet side of the first colored glass plate 41 C, a first stimulating light reflecting film 43 C formed on the stimulating light outlet side of the first colored glass plate 41 C, a second colored glass plate 44 C bonded on the stimulating light outlet side of the first colored glass plate 41 C by way of the first stimulating light reflecting film 43 C, a second stimulating light reflecting film 45 C formed on the stimulating light outlet side of the second colored glass plate 44 C, a third colored glass plate 46 C bonded on the stimulating light outlet side of the second colored glass plate 44 C by way of the second stimulating light reflecting film 45 C, and a third stimulating light reflecting film 47 C formed on the stimulating light outlet side of the third colored glass plate 46 C.
- the stimulating light transmissivity of the stimulating light cut filter 40 C can be 1 ⁇ 10 ⁇ 10 , when the colored glass plates 41 C, 44 C and 46 C are 4 mm in total thickness t3 and 1 ⁇ 10 ⁇ 4 in total stimulating light transmissivity.
- the overall thickness of the stimulating light cut filter can be reduced by 60% (from 10 mm to 4 mm) for a given stimulating light cutting performance (1 ⁇ 10 ⁇ 10 ) as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter.
- the stimulating light cut filter is formed by a plurality of colored glass plates
- the colored glass plates need not be bonded together but may be arranged with an air gap intervening therebetween.
- the stimulating light transmitting film may be eliminated.
- the overall thickness of the stimulating light cut filter can be reduced for a given stimulating light cutting performance as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter, by arranging the transmissivity between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer to be not higher than 10%, or, in the case where the stimulating light cut filter is provided with a plurality of the reflecting layers, by arranging the transmissivity between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer to be not higher than 10% and the transmissivities between adjacent reflecting layers to be all 10% or less.
- a light receiving system 30 ′ detects the stimulated emission emitted from the radiation image convertor panel 10 on opposite sides of a line-like area F (Fa, Fb, Fc, Fd, Fe) extending in the main scanning direction X on the radiation image convertor panel 10 exposed to the stimulating light beam Le projected from the stimulating light beam projecting system 20 .
- the light receiving system 30 ′ comprises five discrete line sensors 62 ( 62 A, 62 B, 62 C, 62 D and 62 E), each comprising a number of CCDs arranged in the main scanning direction X, five discrete imaging lens systems 61 ( 61 A, 61 B, 61 C, 61 D and 61 E), each comprising a number of refractive index profile type lenses arranged in the main scanning direction X, and five discrete stimulating light cut filters 80 ( 80 A, 80 B, 80 C, 80 D and 80 E).
- the line sensors 62 A, 62 C and 62 E are on one side of the area F and the line sensors 62 B and 62 D are on the other side of the area F. That is, the line sensors 62 A to 62 E are arranged in a staggered fashion with the area F intervening therebetween and detect stimulated emission emitted from the respective area Fa to Fe and imaged thereon by the respective imaging lens systems 61 A to 61 E.
- the imaging lens systems 61 A to 61 E are opposed to the respective line sensors 62 A to 62 E and are arranged in a staggered fashion with the area F intervening therebetween.
- the stimulating light cut filters 80 A, 80 B, 80 C, 80 D and 80 E are respectively inserted between the line sensors 62 A to 62 E and the imaging lens systems 61 A to 61 E opposed to each other.
- the stimulating light cut filters 80 A to 80 E remove the stimulating light from the stimulated emission emitted from the respective area Fa to Fe and imaged thereon by the respective imaging lens systems 61 A to 61 E.
- the stimulating light cut filter of the present invention can be applied also to an apparatus, which, for instance, detects stimulated emission emitted from a radiation image convertor panel through a light guide and a photomultiplier without limited to those which detects stimulated emission emitted from a radiation image convertor panel by a line sensor.
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Abstract
Description
- 1. Field of the Invention
- This invention relates to a radiation image read-out apparatus and a stimulating light cut filter for the radiation image read-out apparatus, and more particularly to a radiation image read-out apparatus in which stimulated emission emitted from a radiation image convertor panel upon exposure to stimulating light is detected and to a stimulating light cut filter which transmits the stimulated emission but cuts the stimulating light.
- 2. Description of the Related Art
- When certain kinds of phosphor are exposed to radiation such as X-rays, they store a part of energy of the radiation. Then when the phosphor which has been exposed to the radiation is exposed to stimulating light such as visible light, light is emitted from the phosphor in proportion to the stored energy of the radiation. A phosphor exhibiting such properties is generally referred to as “a stimulable phosphor”. In this specification, the light emitted from the stimulable phosphor upon stimulation thereof will be referred to as “stimulated emission”. There has been known a radiation image recording and reproducing system, comprising a radiation image recording apparatus and a radiation image read-out apparatus, as a CR (computed radiography) in which a layer of the stimulable phosphor is exposed to a radiation passing through an object such as a human body to have a radiation image of the object stored on the stimulable phosphor sheet as a latent image, stimulating light such as a laser beam is projected onto the stimulable phosphor sheet, and the stimulated emission emitted from the stimulable phosphor sheet is photoelectrically detected, thereby obtaining an image signal (a radiation image signal) representing a radiation image of the object. There has been known a radiation image convertor panel comprising a stimulable phosphor layer formed on a substrate as a recording medium employed in the radiation image recording and reproducing system.
- As the radiation image read-out apparatus, there has been known an apparatus comprising a detecting means which detects stimulated emission emitted from a radiation image convertor panel upon exposure to a line-like stimulating light beam extending in a main scanning direction and a stimulating light cut filter which is disposed between the radiation image convertor panel and the detecting means. The stimulating light cut filter is formed of, for instance, colored glass and transmits the stimulated emission but cuts the stimulating light. See, for instance, U.S. Pat. Nos. 6,479,835, 6,495,850, 6,501,088, 6,504,169, 6,512,240 and 6,528,812.
- There has been a demand for shortening the space between the radiation image convertor panel and the detecting means in order to reduce the overall size of the apparatus. Especially in the case of an apparatus comprising a detecting means which detects the stimulated emission by way of an imaging optical system, the resolution can be increased by increasing the numerical aperture (NA) of the imaging optical system by bringing the detecting means nearer to the radiation image convertor panel. The detecting means can be brought nearer to the radiation image convertor panel by making thinner the stimulating light cut filter.
- However, it has been difficult to make thinner the stimulating light cut filter without deteriorating the stimulating light cutting performance by improving the quality of the colored glass forming the stimulating light cut filter.
- In view of the foregoing observations and description, the primary object of the present invention is to provide a stimulating light cut filter which can be thinner for given stimulating light cutting performance.
- Another object of the present invention is to provide a radiation image read-out apparatus employing such a stimulating light cut filter.
- In accordance with a first aspect of the present invention, there is provided a stimulating light cut filter which is disposed between a radiation image convertor panel, which emits stimulated emission upon exposure to stimulating light beam, and a detecting means, which detects the stimulated emission emitted from the radiation image convertor panel, to transmit the stimulated emission and cut the stimulating light and comprises
- an optical element which absorbs the stimulating light, and
- a reflecting layer which reflects the stimulating light.
- In accordance with a second aspect of the present invention, there is provided a stimulating light cut filter which is disposed between a radiation image convertor panel, which emits stimulated emission upon exposure to stimulating light beam, and a detecting means, which detects the stimulated emission emitted from the radiation image convertor panel, to transmit the stimulated emission and cut the stimulating light and comprises
- a plurality of optical elements which absorb the stimulating light, and
- at least one reflecting layer which reflects the stimulating light.
- The “plurality of optical elements” may be bonded together by way of the reflecting layer.
- It is preferred that at least one reflecting layer be disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter.
- It is preferred that the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%.
- In the case where the stimulating light cut filter is provided with a plurality of the reflecting layers, it is preferred that the transmissivity between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less.
- In accordance with a third aspect of the present invention, there is provided a radiation image read-out apparatus which is provided with a detecting means detecting stimulated emission emitted from a radiation image convertor panel upon exposure to a line-like stimulating light beam, and reads out a radiation image recorded on the radiation image convertor panel through an imaging optical system, wherein a stimulating light cut filter comprises an optical element which absorbs the stimulating light and a reflecting layer which reflects the stimulating light is disposed between the radiation image convertor panel and the detecting means to transmit the stimulated emission and cut the stimulating light.
- In accordance with a fourth aspect of the present invention, there is provided a radiation image read-out apparatus which is provided with a detecting means detecting stimulated emission emitted from a radiation image convertor panel upon exposure to a line-like stimulating light beam and reads out a radiation image recorded on the radiation image convertor panel through an imaging optical system, wherein a stimulating light cut filter comprising a plurality of optical elements which absorb the stimulating light and at least one reflecting layer which reflects the stimulating light is disposed between the radiation image convertor panel and the detecting means to transmit the stimulated emission and cut the stimulating light.
- The “plurality of optical elements” of the stimulating light cut filter may be bonded together by way of the reflecting layer.
- It is preferred that the reflecting layer of the stimulating light cut filter be disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter.
- It is preferred that the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%.
- In the case where the stimulating light cut filter is provided with a plurality of the reflecting layers, it is preferred that the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer be not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less.
- In the stimulating light cut filter in accordance with the first aspect of the present invention, the stimulating light is cut by a combination of the optical element and the reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin. Thus the stimulating light cut filter of the first aspect of the present invention can be used in an apparatus where the space between the radiation image convertor panel and the detecting means is small.
- In the stimulating light cut filter in accordance with the second aspect of the present invention, the stimulating light is cut by a combination of a plurality of optical elements and at least one reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin. Thus the stimulating light cut filter of the second aspect of the present invention can be used in an apparatus where the space between the radiation image convertor panel and the detecting means is small.
- When the plurality of optical elements are bonded together by way of the reflecting layer, the stimulating light cut filter can be further smaller in thickness.
- When the reflecting layer is disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter, reflection of the stimulating light at the face of the optical element upon which the stimulated emission impinges first can be reduced, whereby reentrance of the reflected stimulating light into the radiation image convertor panel can be suppressed.
- When the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%, the thickness of the stimulating light cut filter can be surely reduced. Further, in the case where the stimulating light cut filter is provided with a plurality of the reflecting layers, when the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less, the thickness of the stimulating light cut filter can be further surely reduced.
- In the radiation image read-out apparatus in accordance with the third aspect of the present invention, the stimulating light is cut by a combination of the optical element and the reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin. Accordingly, the imaging optical system can be brought nearer to the radiation image convertor panel and can have an increased numerical aperture (NA), whereby the stimulated emission can be imaged at a high resolution and the radiation image read out from the radiation image convertor panel can be high in quality.
- In the radiation image read-out apparatus in accordance with the fourth aspect of the present invention, the stimulating light is cut by a combination of a plurality of optical elements and at least one reflecting layer, whereas it has been conventionally cut solely by an optical element, and the stimulating light cut filter can be thinner for given stimulating light cutting performance since the reflecting layer is very thin. Accordingly, the imaging optical system can be brought nearer to the radiation image convertor panel and can have an increased numerical aperture (NA), whereby the stimulated emission can be imaged at a high resolution and the radiation image read out from the radiation image convertor panel can be high in quality.
- When the plurality of optical elements are bonded together by way of the reflecting layer, the stimulating light cut filter can be further smaller in thickness.
- When the reflecting layer is disposed in an optical path of the stimulated emission along which the stimulated emission propagates behind a face of the optical element upon which the stimulated emission impinges first in the optical elements of the stimulating light cut filter, reflection of the stimulating light at the face of the optical element upon which the stimulated emission impinges first can be reduced, whereby reentrance of the reflected stimulating light into the radiation image convertor panel can be suppressed.
- When the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%, the thickness of the stimulating light cut filter can be surely reduced. Further, in the case where the stimulating light cut filter is provided with a plurality of the reflecting layers, when the transmissivity of the optical path of the stimulated emission between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer is not higher than 10%, and the transmissivities between adjacent reflecting layers be all 10% or less, the thickness of the stimulating light cut filter can be further surely reduced.
- When the stimulating light cut filter is formed by a combination of the optical element which absorbs the stimulating light and the reflecting layer which reflects the stimulating light, the thickness of the stimulating light cut filter can be greatly reduced. The reason for this will be described with reference to FIG. 6, hereinbelow.
- In FIG. 6, it is assumed that a stimulating
light cut filter 50 is formed by a firstoptical element 51 absorbing the stimulating light, a stimulating light transmittinglayer 52 formed on the stimulating light inlet side of the firstoptical element 51, a first reflectinglayer 53 formed on the stimulating light outlet side of the firstoptical element 51 to reflect the stimulating light, a secondoptical element 54 bonded to the stimulating light outlet side of the firstoptical element 51 by way of the first reflectinglayer 53 and a second reflectinglayer 55 formed on the stimulating light outlet side of the secondoptical element 54. - It is further assumed that the transmissivity to the stimulating light of the first and second
optical elements layers layer 52 to the stimulating light is 1 (100%) and the stimulating light enters the stimulatinglight cut filter 50 from the side of the stimulating light transmittinglayer 52. Intensity of the stimulating light impinging upon the stimulating light transmittinglayer 52 is represented by Lin and the intensity of the stimulating light radiated from the second reflectinglayer 55 is represented by Lout. -
- Taking D(1−T)<<1,
- Lout/Lin≈D2×T2 (Law of addition holds between D and T)
- Assuming transmissivity T=0.01 (transmissivity T is 1%),
- Lout/Lin≈D2×0.0001,
- since D<1, the transmissivity of the stimulating light cut filter is lower than 0.01%.
-
- Assuming transmissivity T=0.01 (transmissivity T is 1%),
- Lout/Lin=0.005025,
- and accordingly, the transmissivity of the stimulating light cut filter is 0.5025% and the stimulating light cutting performance of the stimulating light cut filter is poorer.
- That is, when the transmissivity D is small, e.g., not higher than 10%, law of addition holds between D and T by forming a stimulating light cut filter by a combination of a plurality of optical elements and a reflecting layer, whereby the transmissivity of the stimulating light cut filter can be very low. This makes it feasible to reduce the thickness of the stimulating light cut filter without deteriorating its stimulating light cutting performance.
- FIG. 1 is a perspective view briefly showing a radiation image read-out apparatus in accordance with an embodiment of the present invention,
- FIG. 2 is an enlarged side view showing the stimulating beam projecting system and the line sensor employed in the radiation image read-out apparatus shown in FIG. 1,
- FIGS. 3A to3C are side views showing different stimulating light cut filters,
- FIG. 4 is a perspective view for illustrating a radiation image read-out apparatus in accordance with another embodiment of the present invention,
- FIG. 5 is an enlarged side view showing the stimulating beam projecting system and the line sensor employed in the radiation image read-out apparatus shown in FIG. 4, and
- FIG. 6 is side view for illustrating the principle of the present invention.
- In FIGS. 1 and 2, a radiation image read-out
apparatus 100 in accordance with an embodiment of the present invention comprises a stimulating lightbeam projecting system 20 which projects onto a radiation image convertor panel 10 a line-like stimulating light beam Le extending in a main scanning direction X (the direction of arrow X in FIGS. 1 and 2), alight receiving system 30 which detects stimulated emission emitted from the radiationimage convertor panel 10 upon exposure to the stimulating light beam Le, and a conveyor means (not shown) which conveys thelight receiving system 30 relatively to the radiationimage convertor panel 10 in a sub-scanning direction Y (the direction of arrow Y in FIGS. 1 and 2) intersecting the main scanning direction X. - The stimulating light projecting
system 20 comprises abroad area laser 21 which emits a stimulating light beam, a condenseroptical system 22 which includes, for instance, a toric lens and converges a line-like stimulating light beam in a line-like area extending in the main scanning direction X on the radiationimage convertor panel 10 by way of a reflectingmirror 23, and projects a line-like stimulating light beam Le onto the surface of the radiationimage convertor panel 10. As the stimulating light, for instance, light of a wavelength in the range of 500 nm to 900 nm is employed. In this particular embodiment, a semiconductor laser in 600 nm band is employed as thebroad area laser 21. - The
light receiving system 30 is provided with animaging lens system 31, a line sensor (detecting means) 32 formed by a number of CCDs arranged in the main scanning direction X, and a stimulatinglight cut filter 40. Theimaging lens system 31 comprises a number of lenses arranged in the main scanning direction X and forms an erected image of the line-like area of the radiationimage convertor panel 10 exposed to the stimulating light beam Le on theline sensor 32 at unit magnification. The stimulatinglight cut filter 40 is inserted between theimaging lens system 31 and theline sensor 32 and transmits the stimulated emission but cuts the stimulating light. - The stimulating
light cut filter 40 comprises a colored glass plate, an optical element absorbing the stimulating light, and reflecting film (a reflecting layer) which is formed on the surface of the colored glass plate and reflects the stimulating light. Alternatively, the stimulatinglight cut filter 40 comprises a plurality of colored glass plates, optical elements absorbing the stimulating light, and reflecting film (a reflecting layer) which is formed on the surface of at least one of the colored glass plated and reflects the stimulating light. - The stimulating light projecting
system 20 and thelight receiving system 30 are integrated with each other and are simultaneously conveyed in the sub-scanning direction by said conveyor means. - Operation of the radiation image read-out
apparatus 100 of this embodiment will be described, hereinbelow. - A stimulating light beam Le emitted from stimulating light projecting
system 20 is converged in a line-like area F extending in the main scanning direction X on the radiationimage convertor panel 10. The stimulated emission emitted from the line-like area F of the radiationimage convertor panel 10 upon exposure to the stimulating light beam Le is imaged on theline sensor 32 through theimaging lens system 31 and the stimulatinglight cut filter 40 and is photoelectrically converted to be output as electric image signal components. While projecting the stimulating light beam Le and detecting the stimulated emission, the stimulating light projectingsystem 20 and thelight receiving system 30 are simultaneously conveyed by said conveyor means in the sub-scanning direction Y, whereby a radiation image recorded on the radiationimage convertor panel 10 is read out. - Stimulating light cut filters in accordance with different embodiments of the present invention will be described with reference to FIGS. 3A to3C, hereinbelow.
- First Embodiment
- As shown in FIG. 3A, a stimulating
light cut filter 40A in accordance with a first embodiment of the present invention comprises acolored glass plate 41A, a stimulatinglight transmitting film 42A, which transmits the stimulating light by about 100%, formed on the stimulating light inlet side of thecolored glass plate 41A and a stimulatinglight reflecting film 43A formed on the stimulating light outlet side of thecolored glass plate 41A. - In the case where the stimulating light transmissivity of the stimulating
light reflecting film 43A formed on the stimulating light outlet side of thecolored glass plate 41A is 1×10−2, the stimulating light transmissivity of the stimulatinglight cut filter 40A can be 1×10−10, when thecolored glass plate 41A is 8 mm in thickness t1 and 1×10−8 in stimulating light transmissivity. - That is, the overall thickness of the stimulating light cut filter can be reduced by 20% (from 10 mm to 8 mm) for a given stimulating light cutting performance (1×10−10) as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter.
- Second Embodiment
- As shown in FIG. 3B, a stimulating
light cut filter 40B in accordance with a second embodiment of the present invention comprises a firstcolored glass plate 41B, a stimulatinglight transmitting film 42B, which transmits the stimulating light by about 100%, formed on the stimulating light inlet side of the firstcolored glass plate 41B, a first stimulatinglight reflecting film 43B formed on the stimulating light outlet side of the firstcolored glass plate 41B, a secondcolored glass plate 44B bonded on the stimulating light outlet side of the firstcolored glass plate 41B by way of the first stimulatinglight reflecting film 43B, and a second stimulatinglight reflecting film 45B formed on the stimulating light outlet side of the secondcolored glass plate 44B. - In the case where the stimulating light transmissivities of the stimulating
light reflecting films colored glass plates light cut filter 40B can be 1×10−10, when thecolored glass plates - That is, the overall thickness of the stimulating light cut filter can be reduced by 40% (from 10 mm to 6 mm) for a given stimulating light cutting performance (1×10−10) as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter.
- Third Embodiment
- As shown in FIG. 3C, a stimulating
light cut filter 40C in accordance with a third embodiment of the present invention comprises a firstcolored glass plate 41C, a stimulatinglight transmitting film 42C, which transmits the stimulating light by about 100%, formed on the stimulating light inlet side of the firstcolored glass plate 41C, a first stimulatinglight reflecting film 43C formed on the stimulating light outlet side of the firstcolored glass plate 41C, a secondcolored glass plate 44C bonded on the stimulating light outlet side of the firstcolored glass plate 41C by way of the first stimulatinglight reflecting film 43C, a second stimulatinglight reflecting film 45C formed on the stimulating light outlet side of the secondcolored glass plate 44C, a thirdcolored glass plate 46C bonded on the stimulating light outlet side of the secondcolored glass plate 44C by way of the second stimulatinglight reflecting film 45C, and a third stimulatinglight reflecting film 47C formed on the stimulating light outlet side of the thirdcolored glass plate 46C. - In the case where the stimulating light transmissivities of the stimulating
light reflecting films colored glass plates light cut filter 40C can be 1×10−10, when thecolored glass plates - That is, the overall thickness of the stimulating light cut filter can be reduced by 60% (from 10 mm to 4 mm) for a given stimulating light cutting performance (1×10−10) as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter.
- When the stimulating light cut filter is formed by a plurality of colored glass plates, the colored glass plates need not be bonded together but may be arranged with an air gap intervening therebetween.
- The stimulating light transmitting film may be eliminated.
- Even if the stimulating light transmissivity of the colored glass plate is not 10% per 1 mm, the overall thickness of the stimulating light cut filter can be reduced for a given stimulating light cutting performance as compared with when the given stimulating light cutting performance is to be obtained solely by a colored glass plate as in the conventional stimulating light cut filter, by arranging the transmissivity between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer to be not higher than 10%, or, in the case where the stimulating light cut filter is provided with a plurality of the reflecting layers, by arranging the transmissivity between the position in which the stimulated emission first impinges upon the stimulating light cut filter and the position in which the stimulated emission first impinges upon the reflecting layer to be not higher than 10% and the transmissivities between adjacent reflecting layers to be all 10% or less.
- A radiation image read-out apparatus in accordance with another embodiment of the present invention where the light receiving system is of a different arrangement will be described, hereinbelow, with reference to FIGS. 4 and 5.
- In FIGS. 4 and 5, a
light receiving system 30′ detects the stimulated emission emitted from the radiationimage convertor panel 10 on opposite sides of a line-like area F (Fa, Fb, Fc, Fd, Fe) extending in the main scanning direction X on the radiationimage convertor panel 10 exposed to the stimulating light beam Le projected from the stimulating lightbeam projecting system 20. Thelight receiving system 30′ comprises five discrete line sensors 62 (62A, 62B, 62C, 62D and 62E), each comprising a number of CCDs arranged in the main scanning direction X, five discrete imaging lens systems 61 (61A, 61B, 61C, 61D and 61E), each comprising a number of refractive index profile type lenses arranged in the main scanning direction X, and five discrete stimulating light cut filters 80 (80A, 80B, 80C, 80D and 80E). - The
line sensors line sensors line sensors 62A to 62E are arranged in a staggered fashion with the area F intervening therebetween and detect stimulated emission emitted from the respective area Fa to Fe and imaged thereon by the respectiveimaging lens systems 61A to 61E. - The
imaging lens systems 61A to 61E are opposed to therespective line sensors 62A to 62E and are arranged in a staggered fashion with the area F intervening therebetween. - The stimulating light cut filters80A, 80B, 80C, 80D and 80E are respectively inserted between the
line sensors 62A to 62E and theimaging lens systems 61A to 61E opposed to each other. The stimulating light cut filters 80A to 80E remove the stimulating light from the stimulated emission emitted from the respective area Fa to Fe and imaged thereon by the respectiveimaging lens systems 61A to 61E. - The stimulating light cut filter of the present invention can be applied also to an apparatus, which, for instance, detects stimulated emission emitted from a radiation image convertor panel through a light guide and a photomultiplier without limited to those which detects stimulated emission emitted from a radiation image convertor panel by a line sensor.
Claims (18)
Applications Claiming Priority (4)
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JP2002279250 | 2002-09-25 | ||
JP279250/2002 | 2002-09-25 | ||
JP2003207468A JP2004163895A (en) | 2002-09-25 | 2003-08-13 | Radiological image reader and excitation light cut filter |
JP207468/2003 | 2003-08-13 |
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US20040057095A1 true US20040057095A1 (en) | 2004-03-25 |
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EP1462826B1 (en) * | 2003-03-28 | 2007-02-07 | Agfa-Gevaert HealthCare GmbH | Device for reading image information from a phosphor layer |
DE102008025909A1 (en) * | 2008-05-29 | 2009-12-03 | Dürr NDT GmbH & Co. KG | Device for reading out memory foils |
WO2021039921A1 (en) | 2019-08-30 | 2021-03-04 | キヤノン・コンポーネンツ株式会社 | Electromagnetic wave detector, electromagnetic wave detection device, inspection device, and wiring board |
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US20010028047A1 (en) * | 2000-04-03 | 2001-10-11 | Yuji Isoda | Radiation image read-out apparatus |
US6479835B1 (en) * | 1999-07-02 | 2002-11-12 | Agfa-Gevaert | Radiation image detector |
US6495850B1 (en) * | 1999-07-02 | 2002-12-17 | Agfa-Gevaert | Method for reading a radiation image that has been stored in a photostimulable screen |
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US6504169B1 (en) * | 1999-07-02 | 2003-01-07 | Agfa-Gevaert | Method for reading a radiation image that has been stored in a photostimulable screen |
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EP0532800B1 (en) | 1991-09-17 | 1995-08-16 | Agfa-Gevaert N.V. | Method for recording and reproducing a pattern of penetrating radiation |
DE19859747C1 (en) | 1998-12-23 | 2000-02-24 | Agfa Gevaert Ag | Information reading device for data stored in phosphor coating |
DE19942211C2 (en) | 1999-09-03 | 2002-02-07 | Duerr Dental Gmbh Co Kg | Device for reading bendable imaging plates |
EP1168061A3 (en) | 2000-05-17 | 2004-01-07 | Fuji Photo Film Co., Ltd. | Radiation image read-out apparatus |
AU3486401A (en) | 2000-08-21 | 2002-03-04 | 3M Innovative Properties Co | Loss enhanced reflective optical filters |
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- 2003-08-13 JP JP2003207468A patent/JP2004163895A/en active Pending
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US6479835B1 (en) * | 1999-07-02 | 2002-11-12 | Agfa-Gevaert | Radiation image detector |
US6495850B1 (en) * | 1999-07-02 | 2002-12-17 | Agfa-Gevaert | Method for reading a radiation image that has been stored in a photostimulable screen |
US6501088B1 (en) * | 1999-07-02 | 2002-12-31 | Agfa-Gevaert | Method and apparatus for reading a radiation image that has been stored in a photostimulable screen |
US6504169B1 (en) * | 1999-07-02 | 2003-01-07 | Agfa-Gevaert | Method for reading a radiation image that has been stored in a photostimulable screen |
US6512240B1 (en) * | 1999-07-02 | 2003-01-28 | Agfa-Gevaert | Method and apparatus for reading a radiation image that has been stored in a photostimulable screen |
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